阅读说明：本技术 断路器 (Circuit breaker ) 是由 假重太智 于 2020-11-13 设计创作，主要内容包括：断路器具有：棘轮齿轮、输送爪(92)、防逆转爪、电动机(94)和负载降低部(100)。棘轮齿轮通过合闸弹簧向第1方向被预紧。电动机(94)在与输送爪(92)之间设置的传递机构(95)安装输出轴(94a),通过使输出轴(94a)旋转而经由传递机构(95)使输送爪(92)移动,使棘轮齿轮向第1方向的反方向即第2方向旋转。负载降低部(100)在从通过输送爪(92)向第2方向进行了旋转的棘轮齿轮由于防逆转爪而向第1方向的旋转受到限制起至下一次通过输送爪(92)使棘轮齿轮向第2方向旋转为止的期间,降低电动机(94)的旋转速度。(The circuit breaker is provided with: a ratchet gear, a conveying claw (92), a reverse rotation preventing claw, a motor (94) and a load reducing part (100). The ratchet gear is biased in the 1 st direction by a closing spring. The motor (94) has an output shaft (94a) attached to a transmission mechanism (95) provided between the motor and the transport pawl (92), and rotates the output shaft (94a) to move the transport pawl (92) via the transmission mechanism (95) and rotate the ratchet gear in the 2 nd direction, which is the reverse direction of the 1 st direction. The load reduction unit (100) reduces the rotation speed of the motor (94) during a period from when the rotation of the ratchet gear in the 1 st direction by the reverse rotation prevention pawl is restricted by the ratchet gear rotated in the 2 nd direction by the conveyance pawl (92) to when the ratchet gear is rotated in the 2 nd direction by the conveyance pawl (92) next time.)

1. A circuit breaker, comprising:

a ratchet gear pre-tightened in a 1 st direction by a closing spring;

a conveying claw engaged with the ratchet gear;

an anti-reverse pawl that restricts rotation of the ratchet gear in the 1 st direction by the closing spring;

a motor having an output shaft attached to a transmission mechanism provided between the motor and the transport claw, and configured to rotate the ratchet gear in a 2 nd direction, which is a direction opposite to the 1 st direction, by rotating the output shaft to move the transport claw via the transmission mechanism; and

and a load reduction unit that reduces a rotation speed of the motor until the ratchet gear is rotated in the 2 nd direction next time by the conveyance pawl, after the ratchet gear rotated in the 2 nd direction by the conveyance pawl is restricted from rotating in the 1 st direction by the reverse rotation prevention pawl.

2. The circuit breaker of claim 1,

the load reduction unit includes:

a cam that rotates in synchronization with rotation of an output shaft of the transmission mechanism; and

and a switch having an actuator that contacts the cam and a contact portion that controls the motor based on a position of the actuator.

3. The circuit breaker of claim 2,

a concave portion or a convex portion is formed at an outer edge portion of the cam,

the actuator abuts against the concave portion or the convex portion during the period,

the contact portion is connected to a circuit for supplying electric power to the motor, and when the actuator moves to a position where the actuator abuts against the concave portion or the convex portion, the electric power supplied to the motor is reduced or made zero, thereby reducing the rotation speed of the motor.

Technical Field

The present invention relates to a circuit breaker in which a closing spring is charged by a motor and a circuit is closed by the force of the charged closing spring.

Background

Conventionally, a circuit breaker having a ratchet charging mechanism for charging a closing spring by a motor is known. For example, patent document 1 discloses a circuit breaker including: a ratchet gear pre-tightened by a closing spring; a conveying claw which is clamped with the ratchet wheel gear; and a motor for rotating the ratchet gear by the conveying claw to store energy in the closing spring.

In a circuit breaker having a ratchet-type charging mechanism, a loaded period and an unloaded period are alternately generated. The loaded period is a period from when the conveying claw starts to rotate the ratchet gear in the direction opposite to the biasing direction of the closing spring until the rotation of the ratchet gear in the biasing direction is restricted by the reverse rotation preventing claw. The no-load period is a period from when the rotation of the ratchet gear in the biasing direction is restricted by the reverse rotation preventing pawl until the next time the pawl is conveyed to start rotating the ratchet gear in the reverse direction of the biasing direction.

Patent document 1: japanese Kokai publication Hei-3-127740

However, in the circuit breaker having the ratchet type charging mechanism, when switching from the no-load period to the load period, a large load is suddenly applied to the transmission mechanism provided between the transport claw and the motor.

Disclosure of Invention

The present invention has been made in view of the above circumstances, and an object of the present invention is to provide a circuit breaker capable of reducing the magnitude of a load applied to a transmission mechanism when switching from a no-load period to a loaded period.

In order to solve the above-described problems and achieve the object, a circuit breaker according to the present invention includes a ratchet gear, a conveying pawl, a reverse rotation preventing pawl, a motor, and a load reducing portion. The ratchet gear is biased in the 1 st direction by a closing spring. The conveying claw is clamped with the ratchet wheel gear. The reverse rotation preventing claw restricts rotation of the ratchet gear in the 1 st direction by the closing spring. The motor has an output shaft attached to a transmission mechanism provided between the motor and the transport claw, and moves the transport claw via the transmission mechanism by rotating the output shaft, thereby rotating the ratchet gear in the 2 nd direction, which is the opposite direction of the 1 st direction. The load reduction unit reduces the rotation speed of the motor during a period from when the rotation of the ratchet gear in the 1 st direction by the anti-reverse pawl is restricted by the ratchet gear rotated in the 2 nd direction by the transport pawl to when the ratchet gear is rotated in the 2 nd direction by the transport pawl next time.

ADVANTAGEOUS EFFECTS OF INVENTION

According to the present invention, it is possible to reduce the magnitude of the load applied to the transmission mechanism when switching from the no-load period to the load period.

Drawings

Fig. 1 is a side sectional view of a circuit breaker in an open state in which charging is completed according to embodiment 1 of the present invention.

Fig. 2 is a diagram showing a state of a part of the structure of the circuit breaker in the state shown in fig. 1.

Fig. 3 is a diagram showing a relationship among the main shaft, the arm for the insulated link, and the insulated link according to embodiment 1.

Fig. 4 is a diagram showing a state of a part of the structure of the circuit breaker in the state shown in fig. 1.

Fig. 5 is a sectional view of the circuit breaker main body in a case where the circuit breaker according to embodiment 1 is in a tripped state.

Fig. 6 is a diagram showing a state of a part of the structure of the circuit breaker in the state shown in fig. 5.

Fig. 7 is a side view showing an example of the electric charging mechanism according to embodiment 1.

Fig. 8 is a front view showing an example of the electric charging mechanism according to embodiment 1.

Fig. 9 is a side view showing an example of the electric charging mechanism according to embodiment 1.

Fig. 10 is a diagram for explaining the operation of the electric charging mechanism according to embodiment 1.

Fig. 11 is a diagram showing changes in load torque applied to the output shaft of the reduction gear in the electric charging mechanism according to embodiment 1.

Fig. 12 is a diagram showing an example of the structure of the cam according to embodiment 1.

Fig. 13 is a diagram showing an example of the relationship between the motor and the contact portion of the microswitch in the electric charging mechanism according to embodiment 1.

Fig. 14 is a diagram showing another example of the relationship between the motor and the contact portion of the microswitch in the electric charging mechanism according to embodiment 1.

Fig. 15 is a diagram showing changes in the load torque and the contact state of each microswitch according to embodiment 1.

Description of the reference numerals

1 circuit breaker, 4 arc extinguishing chamber, 6 electric system, 7 mechanism system, 10 frame, 10a molded case, 10b molded cover, 16a, 16b frame, 16c long hole, 17 guide plate, 18 closing spring, 21 cam shaft, 22 charging cam, 22a cam side roller, 22b cam surface, 24 charging arm, 24a common fixed shaft, 24b arm side roller, 24c working surface, 24d spring hook pin, 25 st 1 closing latch, 25a latch side roller, 26 nd 2 closing latch, 26a, 30a fixed shaft, 26b protrusion, 26c engaging part, 27 closing lever, 28 main shaft, 28a insulating link arm, 28b nd 2 link arm, 29 closing toggle lever mechanism, 29a 1 st link, 29b nd 2 link, 29c, 29d, 30b pin, 29e link side roller, 30 link lever, 30c lever side roller, 31 trip latch, 32 trip lever, 41 insulating link lever, 42 load side fixed conductor, 43 movable contact, 43a movable contact, 44 power supply side fixed conductor, 44a fixed contact, 45 flexible conductor, 46 movable piece holder, 47 pressure contact spring, 48 holder shaft, 49 connecting pin, 82 nut, 90 electric charging mechanism, 91 ratchet gear, 91a gear teeth, 92 conveying claw, 92a, 93a front end part, 93 anti-reverse claw, 94 motor, 94a, 95c output shaft, 95 transmission mechanism, 95a reduction gear, 95b rotating component, 96, 98 spring, 100 load reducing part, 101, 111 cam, 101a, 111a recess, 101b opening part, 102a, 112a actuator, 102b, 112b contact part, E power supply, R1, R2 resistor, SW1, SW2 microswitch.

Detailed Description

Hereinafter, a circuit breaker according to an embodiment of the present invention will be described in detail with reference to the drawings. The present invention is not limited to the present embodiment.

Embodiment 1.

Fig. 1 is a side sectional view of a circuit breaker in an open state in which charging is completed according to embodiment 1 of the present invention. Fig. 2 is a diagram showing a state of a part of the structure of the circuit breaker in the state shown in fig. 1. Fig. 3 is a diagram showing a relationship among the main shaft, the arm for the insulated link, and the insulated link according to embodiment 1. Fig. 4 is a diagram showing a state of a part of the structure of the circuit breaker in the state shown in fig. 1. Fig. 5 is a sectional view of the circuit breaker main body in a case where the circuit breaker according to embodiment 1 is in a tripped state. Fig. 6 is a diagram showing a state of a part of the structure of the circuit breaker in the state shown in fig. 5.

The circuit breaker 1 shown in fig. 1 is an air circuit breaker and is connected between a power supply device, not shown, and a load device, not shown. The load device is, for example, an electrical device that consumes power supplied from the power supply device. The circuit breaker 1 includes an insulating housing 10, and the housing 10 includes a mold case 10a and a mold cover 10 b. In the housing 10, components of the electrical system 6 that mainly perform opening and closing of the main circuit are arranged on the right side in fig. 1, and components of the mechanism system 7 that performs opening and closing are arranged on the left side in fig. 1.

The electrical system 6 of the circuit breaker 1 has: a load side fixed conductor 42 having one end protruding from the housing 10 and connected to a load device; a movable contact 43 to which a movable contact 43a is fixed; and a power supply side fixed conductor 44 having one end protruding from the housing 10 and connected to the power supply device and the other end fixed to a fixed contact 44a facing the movable contact 43 a. In the drawings including fig. 1, for ease of understanding of the description, a 3-dimensional orthogonal coordinate system is shown in which the vertical direction is the direction of the Z axis, the direction in which the load-side fixed conductor 42 and the power-supply-side fixed conductor 44 extend is the direction of the X axis, and the directions orthogonal to the X axis and the Z axis are the directions of the Y axis.

The electric system 6 further includes a flexible conductor 45, and the flexible conductor 45 has flexibility, and one end thereof is fixed to the frame 10 and the other end thereof is fixed to the movable contact 43. The movable contact 43a and the fixed contact 44a are in contact, and thereby the load side fixed conductor 42 and the power supply side fixed conductor 44 are electrically connected via the flexible conductor 45. The movable contact 43 on which the movable contact 43a is arranged is attached to the mechanism system 7 by a connecting pin 49, and is driven by the mechanism system 7.

Further, the electrical system 6 includes: a movable piece holder 46 having one end rotatably attached to a holder shaft 48 held by the mold case 10 a; a crimp spring 47 mounted between the mold case 10a and the movable contact 43; and an arc extinguishing chamber 4. When the circuit breaker 1 is in the open state shown in fig. 1, the movable contact 43a is biased in a direction to be away from the fixed contact 44a by the pressure contact spring 47. In addition, when the circuit breaker 1 is in the closed state shown in fig. 4, the movable contact 43a is biased in a direction of pressing against the fixed contact 44a by the pressure contact spring 47. The arc extinguishing chamber 4 interrupts an arc generated when the movable contact 43a is pulled away from the fixed contact 44 a.

Next, the mechanism system 7 of the circuit breaker 1 will be explained. As shown in fig. 2, the circuit breaker 1 includes: a frame 16 fixed to the housing 10, including a pair of frames 16a and 16 b; a camshaft 21; and a nut 82. The frame 16a and the frame 16b are disposed at intervals by the cam shaft 21 and the nut 82. The camshaft 21 is a bolt, but may be a member other than a bolt.

The mechanism system 7 is configured to be clamped between the frame 16a and the frame 16 b. The holder shaft 48, the coupling pin 49, and the respective shafts in the mechanism system 7 are arranged in the Y-axis direction, which is a direction parallel to the axis of the camshaft 21, unless otherwise specified.

The mechanism system 7 of the circuit breaker 1 has: a guide plate 17 having one end fixed to the frame 16 and extending upward in fig. 1; a closing spring 18 attached to the guide plate 17; an energy charging arm 24, the middle part of which is rotatably supported on a common fixed shaft 24 a; and a charging cam 22 that rotates a charging arm 24.

A spring hook pin 24d is provided at one end of the charging arm 24, and the spring hook pin 24d is inserted into an elongated hole 16c formed in the frame 16. One end of the closing spring 18 abuts against the spring hook pin 24d, and the other end abuts against the frame 16. The charging cam 22 is fixed to the camshaft 21.

The mechanism system 7 includes an electric charging mechanism 90, and the electric charging mechanism 90 rotates the charging cam 22 to charge the closing spring 18. The electric charging mechanism 90 has a ratchet gear 91. The ratchet gear 91 is fixed to the cam shaft 21 in the same manner as the charging cam 22, and the electric charging mechanism 90 rotates the ratchet gear 91 to rotate the charging cam 22. The specific structure of the electric charging mechanism 90 will be described later.

An arm-side roller 24b is provided at the other end of the charging arm 24, and the arm-side roller 24b abuts against the cam surface 22b of the charging cam 22. The arm-side roller 24b is moved along the cam surface 22b by the rotation of the charging cam 22.

Further, the mechanism system 7 includes: a 1 st close latch 25 whose base end is rotatably supported by the common fixed shaft 24 a; a 2 nd closing latch 26 rotatably supported by the fixed shaft 26 a; and a closing lever 27, a part of which is formed in a semi-cylindrical shape.

The charging cam 22 has a cam side roller 22a provided between the ratchet gear 91 and the charging cam, and the leading end of the 1 st closing latch 25 abuts on the cam side roller 22 a. A latch-side roller 25a is provided midway between the base end and the tip end of the 1 st closing latch 25, and this latch-side roller 25a abuts on one end of the 2 nd closing latch 26.

A projection 26b and an engagement portion 26c are formed at one end of the 2 nd closing latch 26. The 2 nd closing latch 26 receives a counterclockwise force in fig. 1 by a not-shown return spring, and therefore the projection 26b rotates the 1 st closing latch 25 clockwise. When the circuit breaker 1 is in the state shown in fig. 1, the 1 st close latch 25 is in a state of abutting against the cam side roller 22a, the cam side roller 22a becomes a stopper, and the 1 st close latch 25 is held in a state of being unable to rotate. The closing lever 27 is rotated clockwise by a manual operation of an on button or an on operation of a solenoid or the like, not shown.

As shown in fig. 3, the mechanism system 7 includes: a main shaft 28; an insulating link arm 28a fixed to the main shaft 28; and a 2 nd link arm 28b fixed to the main shaft 28 and disposed between the insulating link arms 28 a. The main shaft 28 is rotatably supported by the frame 16. The insulating link arm 28a is disposed at 3 equal intervals at the base end of the main shaft 28 in the extending direction. The insulating link arm 28a and the 2 nd link arm 28b have the same shape. The insulating link arm 28a is rotatably connected to one end of an insulating link 41 shown in fig. 4 by a pin not shown. The other end of the insulating link 41 is connected to the movable contact 43.

As shown in fig. 1 and 4, the mechanism system 7 includes: a closing toggle link mechanism 29; a link lever 30 rotatably supported by the fixed shaft 30 a; a trip latch 31 rotatably supported on the fixed shaft 26 a; and a trip lever 32 engaged with one end of the trip latch 31.

The closing toggle link mechanism 29 includes a 1 st link 29a, a 2 nd link 29b, and pins 29c and 29 d. One end of the 1 st link 29a is rotatably coupled to one end of a link lever 30 via a pin 30 b. The other end of the 1 st link 29a and one end of the 2 nd link 29b are coupled by a pin 29 d. The other end of the 2 nd link 29b is connected to the other end of the 2 nd link arm 28b by a pin 29 c. A lever-side roller 30c is provided in the link lever 30 at a middle portion between one end and the rotation center. The side surface of the trip latch 31 is engaged with the lever-side roller 30 c.

In the state shown in fig. 1, if an on button, not shown, is pressed, the closing lever 27 rotates clockwise, and the 2 nd closing latch 26 is unlocked by the closing lever 27. The 2 nd closing latch 26 whose lock is released rotates clockwise in fig. 1, and the engagement between the engaging portion 26c and the latch-side roller 25a is disengaged. Therefore, the charging cam 22 rotates counterclockwise in fig. 1 while rotating the 1 st closing latch 25 counterclockwise in fig. 1 by the cam side roller 22a, and therefore the arm side roller 24b falls to the step portion of the cam surface 22b of the charging cam 22. Therefore, the charging arm 24 is in a free state.

When the charging arm 24 is in the free state, it is rotated counterclockwise in fig. 1 by the releasing force of the closing spring 18, and the link-side roller 29e of the toggle link mechanism 29 is closed as the operating surface 24c goes up. Since the trip latch 31 is locked by the operation of the trip lever 32 counterclockwise in fig. 1, the closing toggle link mechanism 29 is extended and the 2 nd link arm 28b is rotated counterclockwise in fig. 1.

As a result, as shown in fig. 5 and 6, in the circuit breaker 1, the movable contact 43a and the fixed contact 44a come into contact with each other, and the circuit is closed. In the state shown in fig. 5, the contact spring 47 applies a clockwise rotation force to the link lever 30 through the closing toggle mechanism 29 and the pin 30b in fig. 5, but the trip lever 32 prevents the counterclockwise rotation of the link lever 30 in fig. 5.

In the trip state where the closing spring 18 is released as shown in fig. 5, if the ratchet gear 91 is rotated counterclockwise in fig. 5 by the driving of the ratchet gear 91 in the electric charging mechanism 90, the charging cam 22 is rotated counterclockwise in fig. 5. Thereby, the charging arm 24 rotates clockwise in fig. 5 about the cam shaft 21 to the position shown in fig. 1, and the closing spring 18 is pressed by the spring hook pin 24d, so that the closing spring 18 is charged. As described above, the closing spring 18 is in the energy storage completed state shown in fig. 1 and 4.

Next, the structure of the electric charging mechanism 90 will be specifically described. Fig. 7 is a side view showing an example of the electric charging mechanism according to embodiment 1. Fig. 8 is a front view showing an example of the electric charging mechanism according to embodiment 1. Fig. 9 is a side view showing an example of the electric charging mechanism according to embodiment 1. In fig. 8 and 9, a part of the structure of the electric charging mechanism 90 including the ratchet gear 91 is not shown.

As shown in fig. 7, the electric charging mechanism 90 includes: a ratchet gear 91 formed with a plurality of gear teeth 91 a; a conveying claw 92; an anti-reverse pawl 93; and springs 96, 98. The ratchet gear 91 is biased clockwise in fig. 7 by the closing spring 18 via the charging arm 24, the charging cam 22, and the cam shaft 21. Hereinafter, a direction in which the ratchet gear 91 rotates by biasing by the closing spring 18 may be referred to as a biasing direction. The pretensioning direction is an example of the 1 st direction.

The tip end portion 92a of the conveyance pawl 92 engages with the gear teeth 91a of the ratchet gear 91. The spring 96 is disposed between the base end portion of the transport claw 92 and the frame 16, and biases the transport claw 92 counterclockwise in fig. 7.

A base end portion of the reverse rotation preventing claw 93 is rotatably attached to the frame 16. The reverse rotation preventing pawl 93 is biased counterclockwise in fig. 7 by a spring 98, and a tip end portion 93a engages with the gear teeth 91a of the ratchet gear 91. Thus, the reverse rotation preventing pawl 93 restricts rotation of the ratchet gear 91 in the biasing direction. The reverse rotation preventing pawl 93 does not restrict rotation of the ratchet gear 91 in the direction opposite to the biasing direction.

As shown in fig. 8, the electric charging mechanism 90 includes: an electric motor 94; and a transmission mechanism 95 that transmits the rotational force of the output shaft 94a of the motor 94 to the conveying claw 92. The motor 94 is a dc motor that rotates an output shaft 94a by dc power, but may be an ac motor.

The transmission mechanism 95 includes: a reduction gear 95a whose input side gear is attached to an output shaft 94a of the motor 94; and a rotating member 95b attached to an output shaft 95c of the reduction gear 95a and rotating about the output shaft 95 c. The base end of the transport claw 92 is rotatably attached to a position deviated from the rotation center of the rotating member 95 b.

The rotation member 95b is biased counterclockwise in fig. 7 by a spring 96 shown in fig. 7 with the output shaft 95c as the rotation center. If the output shaft 94a of the motor 94 rotates and the output shaft 95c of the reduction gear 95a rotates, the rotating member 95b rotates counterclockwise in fig. 7. If the rotating member 95b is rotated counterclockwise in fig. 7, the conveying claw 92 repeats the same reciprocating curvilinear motion as the circular slider crank a plurality of times, whereby the conveying claw 92 rotates the ratchet gear 91.

As described above, in the electric charging mechanism 90, the output shaft 94a is attached to the transmission mechanism 95 provided between the electric motor 94 and the transport claws 92, and the transport claws 92 are reciprocated by the rotation of the output shaft 94a via the transmission mechanism 95. Thereby, the ratchet gear 91 rotates in the direction opposite to the biasing direction. The opposite direction to the pretensioning direction is an example of the 2 nd direction.

Fig. 10 is a diagram for explaining the operation of the electric charging mechanism according to embodiment 1. In the 1 st state of the electric charging mechanism 90 shown in fig. 10, the conveyance pawl 92 engages with the gear teeth 91a of the ratchet gear 91. When the electric charging mechanism 90 starts to rotate the output shaft 94a of the motor 94 from the 1 st state, the feeding pawl 92 moves in a direction to rotate the gear teeth 91a counterclockwise in fig. 10, and therefore the ratchet gear 91 rotates counterclockwise in fig. 10, and the 2 nd state shown in fig. 10 is achieved. In the 2 nd state, the biasing force of the closing spring 18 on the ratchet gear 91 applies a load from the ratchet gear 91 to the transmission mechanism 95 via the conveyance pawl 92.

When the electric charging mechanism 90 further rotates the output shaft 94a of the motor 94 from the 2 nd state, the feed pawl 92 moves in a direction to rotate the gear teeth 91a counterclockwise in fig. 10, and the ratchet gear 91 rotates counterclockwise in fig. 10, thereby bringing the state to the 3 rd state shown in fig. 10. In the 3 rd state, the electric charging mechanism 90 is at a position at which the load from the ratchet gear 91 applied to the transmission mechanism 95 via the feed pawl 92 is at a dead point of zero.

The electric charging mechanism 90 further rotates the output shaft 94a of the motor 94 from the 3 rd state, whereby the feeding pawl 92 moves in the reverse direction to the direction in which the gear teeth 91a rotate counterclockwise in fig. 10. Since the ratchet gear 91 is biased clockwise in fig. 10 by the closing spring 18, the ratchet gear 91 rotates clockwise in fig. 10 in a state in which the biasing force is applied by the closing spring 18, and the 4 th state shown in fig. 10 is achieved.

When the output shaft 94a of the motor 94 is further rotated from the 4 th state of the electric charging mechanism 90, the ratchet gear 91 is rotated clockwise in fig. 10, and the reverse rotation preventing pawl 93 engages with the gear teeth 91a of the ratchet gear 91. The reverse rotation preventing pawl 93 engages with the gear teeth 91a of the ratchet gear 91, and thereby the clockwise rotation of the ratchet gear 91 in fig. 10 is stopped. After the reverse rotation preventing pawl 93 engages with the gear teeth 91a of the ratchet gear 91, if the output shaft 94a of the motor 94 is further rotated, the 5 th state shown in fig. 10 is achieved. In the 5 th state, the frictional force generated between the conveying pawl 92 and the ratchet gear 91 is applied, but since the ratchet gear 91 does not rotate due to the reverse rotation preventing pawl 93, the biasing force generated by the closing spring 18 is not applied to the transmission mechanism 95 via the conveying pawl 92.

Fig. 11 is a diagram showing changes in load torque applied to the output shaft of the reduction gear in the electric charging mechanism according to embodiment 1. The 1 st to 5 th states in fig. 11 correspond to the 1 st to 5 th states shown in fig. 10. In fig. 11, the vertical axis shows the load torque applied to the output shaft 95c of the reduction gear 95a, and the horizontal axis shows the rotation angle of the output shaft 95c of the reduction gear 95 a.

The output shaft 95c of the reduction gear 95a rotates the ratchet gear 91 at an angle corresponding to the gear teeth 91a for every 1 cycle from time t10 to t30 of 1 cycle of rotation. The output shaft 95c of the reduction gear 95a is repeatedly rotated, whereby the ratchet gear 91 is brought into the state shown in fig. 1. Note that time t30 is the time before switching from the no-load period to the load period.

The loaded period shown in fig. 11 is a period from time t10 to time t 20. That is, the loaded period is a period from when the ratchet gear 91 starts rotating in the reverse direction of the biasing direction by the feed pawl 92 until the rotation in the biasing direction is restricted by the reverse rotation preventing pawl 93 in a period in which the output shaft 95c of the reduction gear 95a rotates 1 revolution. During this loaded period, the load from the ratchet gear 91 is applied to the transmission mechanism 95 by the biasing force generated by the closing spring 18.

The no-load period shown in fig. 11 is a period from time t20 to time t 30. That is, the no-load period is a period from when the rotation of the ratchet gear 91 in the biasing direction by the reverse rotation preventing pawl 93 is restricted until the ratchet gear 91 is rotated in the reverse direction of the biasing direction by the conveyance pawl 92 next time, in a period of 1 cycle. In other words, the no-load period is a period in which the torque generated by the biasing force of the closing spring 18 is not applied to the transmission mechanism 95.

As described above, in the electric charging mechanism 90, the loaded period and the unloaded period are repeated by the rotation of the output shaft 95c of the reduction gear 95 a. When switching from the no-load period to the loaded period, the conveying pawl 92 is pressed against the gear teeth 91a of the ratchet gear 91 that is stopped. Therefore, the higher the moving speed of the conveying claw 92, the larger the load suddenly applied to the transmission mechanism 95. Therefore, the electric charging mechanism 90 of the circuit breaker 1 includes a load reduction unit 100 that reduces the rotation speed of the motor 94 during the no-load period. The rotation speed of the motor 94 is the rotation speed of the output shaft 94a in the motor 94.

As shown in fig. 8, the load reduction unit 100 includes: a cam 101 attached to the output shaft 95c of the reduction gear 95 a; and a microswitch SW1 provided at a position opposing the cam 101. The cam 101 rotates in synchronization with the rotation of the output shaft 95c of the reduction gear 95 a. In the example shown in fig. 8, the cam 101 is attached to the output shaft 95c, but may be attached to another rotating shaft that rotates in synchronization with the output shaft 95 c.

Fig. 12 is a diagram showing an example of the structure of the cam according to embodiment 1. As shown in fig. 12, the cam 101 is formed in a disk shape, and a recess 101a is formed in a part of the outer edge. The cam 101 is provided with an opening 101b at the center thereof for inserting the output shaft 95c of the reduction gear 95a therethrough.

As shown in fig. 9, the microswitch SW1 includes: an actuator 102a abutting on an outer edge of the cam 101; and a contact portion 102b connected to a circuit for supplying electric power to the motor 94, and controlling the motor 94 based on the position of the actuator 102 a. The microswitch SW1 is, for example, a c-contact switch.

The actuator 102a of the microswitch SW1 abuts against the recess 101a of the cam 101 during at least a part of the no-load period. For example, in fig. 11, the actuator 102a abuts on the recess 101a of the cam 101 in a range from the time t21 to a position immediately before the time t30, and when the time t30 is reached, the actuator 102a is in a position not abutting on the recess 101 a. Therefore, the b-contact of the microswitch SW1 is turned on during a period from the time t21 to the time t30 shown in fig. 11, and thereafter the a-contact of the microswitch SW1 is turned on at the time t30 immediately before the switching from the no-load period to the loaded period.

Fig. 13 is a diagram showing an example of the relationship between the motor and the contact portion of the microswitch in the electric charging mechanism according to embodiment 1. In the example shown in fig. 13, the contact 102b of the microswitch SW1 is connected in series with the motor 94, and the motor 94 is connected to either a series connection body of the resistor R1, the power source E, and the contact 112b of the microswitch SW2, or the resistor R2. The configuration of the microswitch SW2 will be described later.

The contact 102b connects the motor 94 to a series connection body of the resistor R1, the power supply E, and the contact 112b of the microswitch SW2 at a position where the actuator 102a does not abut against the recess 101 a. Thereby, a current flows from the power source E to the motor 94 through the resistor R1 and the contact 112 b. The contact 102b connects the motor 94 and the resistor R2 at a position where the actuator 102a abuts against the recess 101 a. Thereby, the power supply to the motor 94 is cut off during at least a part of the no-load period.

Since the resistor R2 is connected in parallel with the motor 94, a current flows through the resistor R2 due to an induced electromotive force of the motor 94, and the motor 94 is braked. Therefore, the rotational speed of the motor 94 is reduced. The amount of braking experienced by the motor 94 is determined by the resistance of the resistor R2.

As described above, the electric charging mechanism 90 reduces the rotation speed of the electric motor 94 during at least a portion of the no-load period. Therefore, when switching from the no-load period to the load period, the rotation speed of the motor 94 is reduced as compared with the case where the power supply to the motor 94 is continued. Therefore, the kinetic energy at the time of switching from the no-load period to the loaded period can be reduced, and the magnitude of the load applied to the transmission mechanism 95 can be reduced at the time of switching from the no-load period to the loaded period. When the electric power supply to the electric motor 94 is continued, if the no-load period is long, the rotation speed of the electric motor 94 during the no-load period becomes high. Therefore, if the no-load period is long while the electric power supply to the electric motor 94 is continued, the load applied to the transmission mechanism 95 when switching from the no-load period to the loaded period further increases. In the electric charging mechanism 90, the rotation speed of the electric motor 94 is reduced during at least a part of the no-load period, and therefore, even when the no-load period is long, the magnitude of the load applied to the transmission mechanism 95 can be reduced.

Fig. 14 is a diagram showing another example of the relationship between the motor and the contact portion of the microswitch in the electric charging mechanism according to embodiment 1. In the example shown in fig. 14, the microswitch SW1 is connected in series to the motor 94, the contact portion 112b of the microswitch SW2 and the power source E, and either one of the resistor R1 and the resistor R2 is connected in series to the motor 94. The resistance value of the resistor R1 is smaller than that of the resistor R2.

The contact 102b connects the motor 94 to the resistor R1 at a position where the actuator 102a does not abut against the recess 101 a. Thereby, a current flows from the power supply E to the motor 94 via the resistor R1. The contact 102b connects the motor 94 and the resistor R2 at a position where the actuator 102a abuts against the recess 101 a. Accordingly, since a current flows from the power supply E to the motor 94 through the resistor R2, the electric power supplied to the motor 94 becomes smaller and the rotation speed of the motor 94 decreases compared to the case where the motor 94 is connected to the power supply E through the resistor R1.

As described above, the electric charging mechanism 90 reduces the rotation speed of the electric motor 94 during at least a portion of the no-load period. Therefore, the circuit shown in fig. 14 can also reduce the kinetic energy when switching from the no-load period to the loaded period, and can reduce the magnitude of the load applied to the transmission mechanism 95 when switching from the no-load period to the loaded period, as in the circuit shown in fig. 13.

In the above example, the electric charging mechanism 90 decreases the rotation speed of the electric motor 94 from the time t21 to immediately before the time t30 shown in fig. 11, but the present invention is not limited to this example. That is, as long as the kinetic energy at the time of switching from the no-load period to the load period can be reduced, the period for reducing the rotation speed of the motor 94 is not limited to the period from the time t21 to immediately before the time t 30.

In the above example, the concave portion 101a is formed in the outer edge portion of the cam 101, but a convex portion may be provided in the outer edge portion of the cam 101 instead of the concave portion 101 a. In this case, the actuator 102a abuts against the convex portion of the cam 101 during at least a part of the no-load period. This can reduce the rotation speed of the motor 94 during the no-load period. Further, the cam 101 may be configured to have grooves with different depths in the circumferential direction instead of having a concave portion or a convex portion in the outer edge portion. In this case, the actuator 102a of the microswitch SW1 abuts against the groove of the cam 101.

In the above example, the rotational speed of the motor 94 is reduced by using the microswitch SW1 and the cam 101 during the no-load period, but a configuration including an optical position sensor and the microswitch SW1 is also possible. The optical position sensor turns off the contact a of the microswitch SW1 at a position immediately before the 5 th state shown in fig. 11 to the 1 st state, for example, and then turns on the contact a of the microswitch SW1 when the position is the 1 st state.

Next, the function of the microswitch SW2 will be explained. As shown in fig. 9, the electric charging mechanism 90 includes: a cam 111 attached to the camshaft 21; and a microswitch SW2 provided at a position opposing the cam 111. The cam 111 is formed in a disk shape like the cam 101, and a concave portion 111a is formed in a part of an outer edge. The cam 111 has an opening, not shown, at the center thereof for inserting the camshaft 21 therethrough.

As shown in fig. 9, the microswitch SW2 includes: an actuator 112a abutting on an outer edge of the cam 111; and a contact portion 112b that controls the motor 94 based on the position of the actuator 112 a. The microswitch SW2 is a b-contact switch. The contact 112b connects the motor 94 to the power source E at a position where the actuator 112a does not abut against the recess 111 a. The contact 112b separates the motor 94 from the power source E at a position where the actuator 112a abuts against the recess 111 a.

Fig. 15 is a diagram showing changes in the load torque and the contact state of each microswitch according to embodiment 1. The microswitch SW1 shown in fig. 15 is an on state of the circuit breaker 1 in the state shown in fig. 5, and is an off state when the circuit breaker 1 is in the state shown in fig. 1. As a result, when the circuit breaker 1 is in the state shown in fig. 1, the supply of electric power to the motor 94 is interrupted.

The microswitch SW1 is repeatedly turned on and off until the circuit breaker 1 is switched from the state shown in fig. 5 to the state shown in fig. 1. When the motor 94 and the microswitch SW1 are connected as shown in fig. 13, the contact a of the microswitch SW1 is a contact for connecting the motor 94 to the power supply E, and the contact b of the microswitch SW1 is a contact for disconnecting the motor 94 from the power supply E.

As described above, the circuit breaker 1 according to embodiment 1 includes: a ratchet gear 91 biased in the 1 st direction by a closing spring 18; a conveyance claw 92 engaged with the ratchet gear 91; and a reverse rotation preventing claw 93 for limiting the rotation of the ratchet gear 91 in the 1 st direction of the ratchet gear 91 by the closing spring 18. The circuit breaker 1 includes a motor 94 and a load reducing unit 100. The motor 94 has a load reduction portion 100. The motor 94 has an output shaft 94a attached to a transmission mechanism 95 provided between the motor and the transport claw 92, and rotates the output shaft 94a to move the transport claw 92 via the transmission mechanism 95, thereby rotating the ratchet gear 91 in the 2 nd direction, which is the opposite direction of the 1 st direction. The load reduction unit 100 reduces the rotation speed of the motor 94 during a no-load period from when the rotation of the ratchet gear 91 in the 1 st direction that has been rotated in the 2 nd direction by the conveyance claw 92 is restricted by the reverse rotation prevention claw 93 until the ratchet gear 91 is rotated in the 2 nd direction by the conveyance claw 92 next time. This allows the circuit breaker 1 to reduce the magnitude of the load applied to the transmission mechanism 95 when switching from the no-load period to the load period.

Further, the load reduction portion 100 has a cam 101 and a microswitch SW 1. Microswitch SW1 is an example of a switch. The cam 101 rotates in synchronization with the rotation of the output shaft 95c of the transmission mechanism 95. The microswitch SW1 includes: an actuator 102a abutting against the cam 101; and a contact portion 102b that controls the motor 94 based on the position of the actuator 102 a. Thus, the load applied to the transmission mechanism 95 can be reduced when switching from the no-load period to the loaded period with a relatively simple configuration.

Further, a concave portion 101a or a convex portion is formed at an outer edge portion of the cam 101. The actuator 102a abuts against the concave portion 101a or the convex portion during no load. The contact 102b is connected to a circuit for supplying electric power to the motor 94, and when the actuator 102a moves to a position where it contacts the concave portion 101a or the convex portion, the rotation speed of the motor 94 is reduced by reducing the electric power supplied to the motor 94 or by setting the electric power supplied to the motor 94 to zero. With this, the magnitude of the load applied to the transmission mechanism 95 can be reduced when switching from the no-load period to the loaded period with a relatively simple configuration.

The configuration described in the above embodiment is an example of the content of the present invention, and may be combined with other known techniques, and a part of the configuration may be omitted or modified without departing from the scope of the present invention.